pg_db_role_setting records the default values that have been set for run-time configuration variables, for each role and database combination.
Unlike most system catalogs,
pg_db_role_setting is shared across all databases of a cluster: there is only one copy of
pg_db_role_setting per cluster, not one per database.
The OID of the database the setting is applicable to, or zero if not database-specific
The OID of the role the setting is applicable to, or zero if not role-specific
Defaults for run-time configuration variables
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